Congrats on your new bundle!!! Sure your life will be a bit harder, but maybe no more than a lot of other new moms out there. I was 23 when I got pregnant, luckily I had landed a decent job right when I got pregnant so I knew I could afford one on my own. I wasn't able to do it with out family.
You seem to have your life together, so forget everyone else! If you did not ask their opinion then let their remarks just roll off your back. If you did ask for it then jsut smile and nod and try to remember they are coming from a place of caring. The great thing about babies is that once they are here usually that makes everyone forget all the negativity and brings everyone together.
I was able to go back to school with a 2 yr old when I was a single mother to get my license in education and then I am about to finish my Masters, all on my own without the support of the father, so while it is difficult I would not change it for the world. I couldn't imagine doing this any other way with my daughter.
Everyone has challenges in their life, and I wish you the best in yours!
On another note, Ghostmonkey, I am not sure what you are wanting to gain from your post or what you are hoping the OP is going to gain from your post. Sure you have the right to post what ever you wish, and what you posted may not be wrong, but is it needed? Nothing like kicking someone when they are down.